AVer FD1020 quick guide - Manual (Page 10)

6
When no event occurs, the DO output is 5V (DO and GND are disconnected). When the camera
detects events it will trigger and external alarm, DO output is 0V (DO and GND are connected).
If you select N.O on Input sensor setting, when the switch contacts are opened, the camera input
alarm will be triggered and will execute the action user has set, for example, send a snapshot to
E-mail address.
If you select N.C in Input sensor setting, when the switch contacts are closed, the camera input
alarm will be triggered and will execute the action user has set, for example, send a snapshot to
E-mail address.
c. I/O PIN definition

GND (Ground): Initial state is LOW

DO (Digital Output): DC 5V

DI (Digital Input): Max. 50mA, DC 5V